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当采用印制天线作为接收卫星广播用的天线时,由于辐射单元频带窄和馈线损耗,会产生效率下降问题。特别是后者,随着天线阵的大型化,问题变得更加突出,不仅天线效率下降,而且引起G/T和接收性能变坏。本文先就上述两个技术问题,从所使用的天线基板厚度的观点出发进行研究,分别求出符合宽频带和低损耗的最佳基板厚度条件。然后,作为同时满足宽带、低损耗这两个条件的天线构成法,提出将基板厚度分别选择为最佳基板厚度、形成辐射单元和馈线的双层结构形式的方案。根据这种形式,试制了接收卫星广播用的512单元的印制天线阵,结果,在带宽范围内,能做到电压驻波比小于1.3,增益为34dBi(天线效率为60％)。这种结果证实了本构成法作为一种低损耗、宽带印制天线形式的可行性。
When using a printed antenna as an antenna for receiving satellite broadcasts, there is a problem of a decrease in efficiency due to a narrow frequency band of the radiating element and loss of the feeder line. Especially in the latter case, the problem becomes more prominent as the size of the antenna array becomes larger, not only the antenna efficiency decreases but also the G / T and reception performance deteriorate. This paper first studies the above two technical issues from the point of view of the thickness of the antenna substrate to be used, and finds out the optimal substrate thickness conditions in line with the wideband and low loss respectively. Then, as an antenna configuration method that satisfies both conditions of wideband and low loss, a scheme of selecting the optimal substrate thickness as the optimal substrate thickness and forming the double-layered structure of the radiation unit and the feed line is proposed. According to this form, a printed-antenna array of 512 units for satellite broadcasting was trial-made. As a result, the voltage standing wave ratio was less than 1.3 and the gain was 34 dBi (antenna efficiency: 60%) over the bandwidth. This result confirms the feasibility of this method as a form of low loss, broadband printed antenna.